Fig. 1: Comparison of properties of Li/Zn-based halide materials and composition engineering design of Zn-ion solid electrolytes.
From: Zinc-based metal halide electrolytes for all-solid-state zinc-metal batteries
a, b Electron orbital configurations of a Li+ and b Zn2+. Solid blue spheres represent occupied electrons, while orbitals with hollow black spheres represent empty orbitals. c, d Metal-halogen tetrahedron c MX4 and octahedron d MX6 (M = Li or Zn; X = Halogen atom). e, f Energy profiles of Li or Zn ion migration pathways in e β-Li2ZrCl6 and f Cs2ZnCl4. The insets are the crystal structures of e β-Li2ZrCl6 and f Cs2ZnCl4. g Schematic of composition engineering design of Zn-ion solid electrolytes. In the schematic, A represents an inorganic atom, and R represents organic groups. h Structure diagrams of anion unit [ZnX4]2− (X = Halogen atom) and some possible organic cationic clusters.
